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BEIJING (AP) _ Crews pumped water from a mine in northern China on Wednesday, hoping to find survivors among 13 miners trapped when their workplace flooded late last week.

The miners have not been heard from since they were trapped Friday, according to an official at the Gujiao Coal Mine Industrial Administration. She gave only her surname, Li.

She wouldn't say whether rescuers believed any of the miners were still alive. She also said she had no information about how many miners were in the mine when it flooded.

China's mines are among the world's deadliest.

They often lack even basic safety equipment, and miners are usually too poorly trained to understand the risks. More than 3,500 miners have been killed this year in explosions, floods and other mishaps.